/Engine/Source/Runtime/MovieScene/Public/Evaluation/Blending/MovieSceneMultiChannelBlending.h
Generic value type that supports a specific number of channels, optionally masked out. Used for blending types that can be represented as a contiguous set of numeric values. Relative, Weighted and Additive blending occurs on a per-channel basis
template<typename T, uint8 N> struct TMultiChannelValue